to keep our human city while le -- humanity while leading with courage and commitment. it is possible but not easy. for this president, it might not even be something he wants or knows how to do. i want to get the latest now. authorities here in new york briefed reporters late today. so what have you learned, what is the latest development? >> reporter: there have been significant developments in the investigation, certainly for the fbi. they are now at this sorting site in opa-locka south florida, and they're zeroing in on this site, because they believe if not all, most of the packages that were sent came through this site. the other thing there seems to be a large focus now on the south florida area by authorities looking for leads, trying to figure out if the person who sent these is from the south florida area. >> person or persons. >> person or persons. and i can tell you, anderson, authorities tonight are optimistic. earlier today, yesterday, we weren't getting the same kind of